Minimising the Sum of Projections of a Finite Set

Consider the projections of a finite set A ⊂ R n onto the coordinate hyperplanes; how small can the sum of the sizes of these projections be, given the size of A ? In a different form, this problem has been studied earlier in the context of edge-isoperimetric inequalities on graphs, and it can be derived from the known results that there is a linear order on the set of n -tuples with non-negative integer coordinates, such that the sum in question is minimised for the initial segments with respect to this order. We present a new, self-contained and constructive proof, enabling us to obtain a stability result and establish algebraic properties of the smallest possible projection sum. We also solve the problem of minimising the sum of the sizes of the one-dimensional projections.